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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill
Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):
 
Energy Chemistry Technologies
 
Consumer and Industrial Chemistry Technologies
 
Total
Balance at December 31, 2016
$
37,180

 
$
19,480

 
$
56,660

Goodwill impairment recognized
—

 
—

 
—

Balance at June 30, 2017
$
37,180

 
$
19,480

 
$
56,660